*{
    margin: 0;
    padding: 0;
    text-decoration: none;
    list-style: none;
}
.nav{
    display: flex;
    justify-content: space-around;
    align-items: center;
    position: absolute;
    top: 20px;
    left: 110px;
    width: 650px;
    height: 50px;
    background-color: rgba(255,255,255,.2);
}
.nava{
    display: block;
    width: 100px;
    height: 30px;
    line-height: 30px;
    text-align: center;
    background-color: rgba(255,255,255,.6);
    color: rgb(75, 75, 75);
    font-size:18px;
    letter-spacing: 2px;
    border-radius: 4px;
    transition: .2s;
}
.nava:hover{
    background-color: rgb(189, 189, 189);
    color: #000;
}
.top{
    width: 100%;
    height: 90px;
    background-color: white;
    display: flex;
    justify-content: center;
}
.top a{
    color: black;
}
.topbox{
    width: 90%;
    display: flex;
    flex-wrap: wrap;
    align-content: space-around;
}
.topb{
    width: 100%;
    height: 90px;
    line-height: 90px;
    display: flex;
    justify-content: space-between;
}
.topbleft a:hover{
    background-color: rgb(156, 156, 156);
}
.topbleft a{
    width: 100px;
    text-align: center;
}
.topbleft{
    position: absolute;
    display: flex;
    justify-content: space-between;
    width: 450px;
    left: 110px;
}
.topbright{
    position: absolute;
    right: 100px;
    display: flex;
    align-items: center;
    justify-content: space-around;
    width: 300px;
    height: 90px;
    line-height: 90px
}
.topbright input{
    height: 30px;
    border-radius: 10px;
    border: 1px solid #ccc;
    padding-left: 15px;
}

.topimg{
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    height: 600px;
    background-color: rgb(107, 107, 107);
}
.topimg2{
    height: 300px;
}
.topimgbox{
    width: 900px;
    height: 220px;
    display: flex;
    flex-wrap: wrap;
    color: white;
    align-content: space-around;
}
.topimgbox p{
    width: 100%;
    color: rgb(192, 192, 192);
    font-size: 16px;
}
.topimgbox h1{
    font-size: 45px;
}
.topimgbottom{
    width: 100px;
    height: 40px;
    border: 2px solid #ccc;
    border-radius: 5px;
    text-align: center;
    line-height: 40px;
    margin-top: 30px;
}

/* 小图片 */
.smallbox{
    display: flex;
    justify-content: center;
    width: 100%;
    height: 280px;
    margin-top: 100px;
}
.small{
    display: flex;
    justify-content: space-around;
    width: 90%;
    height: 100%;
}
.smallimg{
    width: 200px;
    height: 250px;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-content: space-between;
}
.imgbox{
    width: 200px;
    height: 200px;
    background-color: rgb(105, 105, 105);
}
.smallimg p,.smallimg h3{
    width: 100%;
    text-align: center;
}

/* 文字横幅 */
.text{
    margin-top: 50px;
    margin-bottom: 50px;
    width: 100%;
    height: 100px;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    align-content: space-around;
}
.text h2{
    font-size: 30px;
}
.text p{
    width: 100%;
    text-align: center;
}

/* 中间内容区 */
.middle{
    position: relative;
    width: 80%;
    height: 1350px;
}
.middlebox{
    width: 80%;
    height: 400px;
    display: flex;
    justify-content: flex-start;
    justify-content: space-between;
    align-items: flex-end;
}
.span{
    position: absolute;
    left: -18px;
    writing-mode: tb-rl;
    transform: rotateX(180deg);
}
.span2{
    position: absolute;
    right: -25px;
}
.middleleft{
    width: 300px;
    height: 100%;
    background-color: rgb(97, 97, 97);
}
.middleright{
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-content: space-around;
    width: 500px;
    height: 100%;
}
.middleright p{
    width: 100%;
    text-align: center;
}
.middlerightboximg{
    width: 500px;
    display: flex;
    justify-content: space-between;
}
.smallimg2{
    width: 150px;
    height: 200px;
}
.imgbox2{
    width: 150px;
    height: 150px;
}
.middlerightboxbottom{
    text-align: center;
    line-height: 40px;
    width: 120px;
    height: 40px;
    border: 2px solid #ccc;
}
.middle1{
    position: absolute;
}
.middle2{
    position: absolute;
    right: 0;
    top: 440px;
}
.middle3{
    position: absolute;
    top: 880px;
}

/* 小图片集 */
.imgarr{
    width: 70%;
    height: 300px;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-around;
    align-content: space-around;
    margin-bottom: 80px;
}
.arrimg{
    width: 170px;
    height: 100px;
    background-color: rgb(88, 88, 88);
}


/* 长图片 */
.bottommidle{
    width: 100%;
    height: 300px;
    display: flex;
    align-items: center;
    justify-content: center;
}
.topimg2{
    display: flex;
    justify-content: center;
}
.bml,.bmr{
    width: 450px;
    color: rgb(190, 190, 190);
}
.bml h1,.bmr h1{
    color: white;
    font-size: 46px;
}
.bmr span{
    color: white;
}

/* 下方图文 */
.tw{
    width: 80%;
    height: 450px;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-around;
}
.twbox{
    display: flex;
    align-items: center;
    justify-content: space-around;
    width: 400px;
    height: 200px;
}
.twl{
    width: 150px;
    height: 200px;
    background-color: rgb(126, 126, 126);
}
.twr{
    width: 200px;
    height: 100px;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
}
.twr p{
    width: 100%;
}

/* 底部条 */
.foot{
    width: 100%;
    height: 400px;
    background-color: rgb(129, 129, 129);
    margin-top: 100px;
}